东濮凹陷潜山圈闭勘探回顾与前景

A REVIEW OF BURIED-HILL EXPLORATION IN DONGPU DEPRESSION,EAST CHINA AND ITS POTENTIALITY

东濮凹陷潜山圈闭已有多年的勘探历史,但由于圈闭程度、泥浆性能、录井工作方法、对储层的认识等方面的原因,使勘探效果不够理想。潜山圈闭油源主要来自下第三系,其储集层为古生界、中生界及前寒武系。在凹陷西斜坡,兰聊断裂构造带都是寻找潜山油气藏的有利地区。

Although many years have passed since the beginning of buried-hill exploration in Dongpu depression,oil and gas fields have not been found in any buried-hill traps.The low success ratio of the buried-hill exploration is due to using overweight mud and unsuitable logging-whiledrilling methods, entraping unaccurately,and recognizing only reservoir rocks in the Ordovician and Cambrian strata.In the buried-hill traps of the Dongpu depression,oil sources being from Tertiary,and reservoir rocks include the sandstone in Mesozoic,Carboniferous and Permian strata,carbonatite in Ordovician and Cambrian strata,and metamorphic rock in Proterozoic and Archaeozoic strata. Results of research show that potential buried-hill traps are mainly in the eastern slope region,in which reservoir rocks are Mesozoic,Carboniferous and Permian,and the Lanliao faulting zone region,in which reservoir rocks includes Ordovician,Cambrian,Proterozoic and Archaeozoic.